22C-B024N103

22C-B024N103

22C-B024N103

22C-B024N103

PWM信号的周期是固定的，由载波信号的频率决定; 而占空比则是可变的，表示调制信号在一个周期内处于高电平的时间与整个周期时间的比例。 占空比越大，输出电压或电流的平均值越高，反之亦然。 也就是说控制一个周期内电信号的脉冲宽度和频率，来控制输出电压或电流的大小。 通常，一个周期内的脉冲宽度和频率是可以调节的，从而可以控制输出信号的平均值和波形。

1.载波频率：也称为PWM信号的工作频率，通常是固定的，一般选择几千赫兹至几十千赫兹的频率，以保证足够高的调制精度和低的失真。

2.调制波形：这是用于控制PWM信号占空比的调制信号，可以是模拟信号或数字信号。 在数字控制系统中，调制波形通常是一个由微处理器或FPGA生成的数字信号。

3.占空比：占空比是指PWM信号中高电平时间与一个周期时间之比。 在实际应用中，占空比通常是由调制波形的幅值来控制的。 例如，当调制波形的幅值为0时，PWM信号输出为低电平; 当调制波形的幅值为大值时，PWM信号输出为大的高电平。

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